As someone developing Silverlight games, I'm very intereseted in Silveright gaining an install base.

Until now, it's been pretty difficult to get a good feel for just how large (or small) this Silverlight install-base is.

Recently, I came accross the following site: RIAStats.com

This site allows website owners to install a small chunk of java script that will record what RIA Plug-in visting users have installed.  The site then gathers this data and presents it in two very easy to understand formats. 

As I write this, RIAStats.com is tracking about 25000+ websites and is showing Silverlight 2.0 to be around 15%.  Not bad considering it's still in beta.

Have a look!

http://www.riastats.com/